Are you experiencing hot water in your toilet tank?
When you have hot water in toilet tank something has gone wrong, what that is exactly will require a small bit of troubleshooting to understand. If you are living in a new home and have just moved in there is a chance that the plumber incorrectly connected the hot and cold water lines to the toilet.
If this is actually the case, contact the plumber who installed your plumbing to fix the problem and eliminate the hot toilet water. (However, if this is the case, contact another plumber to inspect the rest of the plumbing in the house just to be safe.)
A more likely scenario is that either the toilet flapper is not functioning properly or you have a bad fill valve. Either of these scenarios will allow water to seep into the tank. If you have a mixing valve on your toilet tank to prevent condensation, the valve mixes hot and cold water to maintain a lukewarm temperature.
During normal operation, you get a fairly steady mix of hot and cold water. However, if the flapper is not functioning properly or the fill valve is bad, small amounts of water will begin continuously seeping into the toilet tank. This is what creates the hot toilet water as the warm water tends to dominate the cold water in this circumstance.
You may try to fix the problem yourself by readjusting the flapper or replacing it. Replacing a fill valve, on the other hand, is a little more complicated procedure. This will take more time to replace than the toilet flapper and is generally more difficult. If you don’t have the time or do not want to go through the hassle of doing the job yourself, call a professional plumber who will be able to fix the issue quickly.